// Copyright 2015 rain1017.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.

'use strict';

var MongoBackend = require('./mongo-backend');
var RedisBackend = require('./redis-backend');

exports.create = function(config){
    config = config || {};
    var engine = config.engine || 'mongodb';

    if(engine === 'mongodb'){
        return new MongoBackend(config);
    }
    else if(engine === 'redis'){
        return new RedisBackend(config);
    }
    else{
        throw new Error('Invalid backend engine');
    }
};
